Mandrel for use in making sinuous headers



Nov. 2 1926. Y 1,605,545

c. P. HIGGINS MANDREL FOR SE TN MAKING SINUOUS HEADERS .Filed June 11. 1923 IlylfEN'ToR.

A BY lvMv A TTORNEYS.

Patented Nov. 2, 1926.

aerien s 'r1-erts rArEN'r orties.

cAiyrrBELLfr. inserite, or EosEL'EE, NEW J'EnsEYAslsIeNon 'ro Tii'E 1ia-Aiacooir 'avvineoX COMPANY, E BAYONNE, NEW JERsEY, A CORPORATION or NEW JERsEY.

ivLANnREL Een UsE iNivrAiktI'N'e"sINuoUs HEADERS.

Appiieation filed 'June 11, 192e. sri'ai Nef/seeker in making'staggered or sinuous headers for steam boilers.

My invention will be best understood Yfrom the `following description taken inconnection with the accompanying draivings'ot an illustrative embodiment oi my invention applied to the 'making of sinuousy headers for boilers, 4in which Fig. 1 is Ial sectional plan vieiv taken on line 1-1 of Fig, 2, which shows a header blank with a mandrel in place; Fig. 2 is a sectional vievv taken on line 2--2 oit' Fig. 3; Fig'. 3 is an ,end view of the devices shown in Fig'. 2; 1 is a vieivsimilar to'Fig. v2, ivith the dies clesed; Fig. 5 is'a section ot the header showing the mandrel in place and the dies and part of the mandrel Withdrawn; Fig. 6 is an end view ot the device shown in lTig. 5, wherein the mandrel has been collapsed; :and Fig. 7

is aside vieiv ot' a portion of the 'completed header. l y

Referring to the drawings, 1 designates a l* aheader blank having the cross section shown in Figjf3,and inivhich the mandrel is placed. Dies 3, 3 and 4, 5 are provided to `press the blank on the mandrel, m the wellknoivn manner, the dies 4;, 5 beineprovided with corrugations to correspond to the shape to be given to the exterior ot the blank.

Because ot the corrugations in the finished header, the mandrel on which it is formed must bedesigned so that it ncan be taken apart to remove it. It is desirable that such a n'i'andrel shall have as teiv parts as nossiblefand that they shall Ibe arranged so that they can be quickly Vand easily assembled and disassembled The mandrel oi my invention embodies these advantages bv beingI V'formed oi ,parts Which preterably Xtend throughout the length of the blank, so that they can beI Withdrawn -one at a time through the open end ef the header Without reaching into the interior.

In the illustrative embodiment, the 'mandrel comprises a plurality of longitudinal members 6, 7, 3, 9, 10, 11, 12 and 13 and a key member 14C. The members 6 to 13, inclusive, are preferably trapezoidal in cross section and preferably extend throughout the length of the blank. The key member 111 is arranged to engage each of the members 6 to 13 and hold the same rigidly in extended position during the forming operation. The members 6-7 and the vmembers 8-9 are vprvided with sinuous or undulating surfaces Which are staggered relative to veach otherso that when the dies 4g, l,'ivhich have corresponding surfaces thereon, are pressed down upon 'the mandrel, the blankis'tormed lifntofaheader having` a serpentine torni. At- 'ter the dies h ave closed to thepositio'n shown in Figure 4, and have been opened to the "position shown in i'gure 5,5the key member 141 is Withdrawn endvviseV from the blank whereupon the other members 6 `to 13, inclusive, take the positions best shown in Fig. 6, whereupon each ot the parts may also be removed endivise, 10 and .11 being removed tirst, then 1 2 and 13 vand then 6, 7, 8 land 9. The removal oit' these members is ,facilitated fby reason of the fact that the plane along `Which ,the contacting surtaces otl the members '6 Aand 7 meet is at an angle to a planeperpendicular to the side of theheader. The same is true ot theplanes ot thecontacting surtacesot the othermembers 3, Sand 10, 11, 12 and 13. Byret'erence to Fig. G, it will be noted that after the key member `14 `and the intermediate members 1Q to 13, inclusive', are removed,

the outside members are Jfree to move toward the longitudinal .axis of the header. The vertical height ofthe key memberle, and the sidepieces 10-13ris made sutlicientto permit the upper parts 6 and to drep down, so that their topsare beloiv the lowest part of` the top of the finished header. 4In use, the mandrel vis assembled in -a ytrough and the'header'blank'is placed with its end against the end of the trough and in line with the trough, The mandrel is forced from the assembly trough into the heated header blank which, With'the mandrel therein, lis'placed between the dieser and 5 and pressed into the desired shape. Y

Changes may be made in the details of the various parts Without departing from the spirit of my invention. For instance, While it is preferable to divide the various members on planes making an angle With the sides of the header, this is not essential, since these may be parallel with the sides. The key member 14 may extend from side to side of the header,.though1 prefer to di vide it as shown. The top and bottom members also may be divided longitudinally in lil lengths equal to one or more undulations in the header.

I claim:

l. A mandrel adapted tor use in making rectangular-cross-sectioned, sinuous headers for boilers, comprising two sets oit' corrugated blocks cach having a surface contiguration to give the desired shape to opposite sides of the header, each ot said blocks being substantially as long as the header to be formed, and a main key member between the sets ot blocks and extending through the header blank, said key member having parallel sides contacting with said sets ot' corrugated blocks.

2. A mandrel adapted for use in making rectangular-cross-sectioned, sinuous headers for boilers, comprising two sets of corrugated blocks each having a surface configuration to give the desired shape to opposite sides of the header, each o' said blocks being not less in length than the distance between adjacent depressions in the sides ot the headers, a main key member between the sets ot blocks and extending through the header blank, said key having parallel sides contacting with said sets oi corrugated blocks, and a supplemental key member at the side of the main key member and ot the same height as the main key member.

3. A mandrel adapted for use in making rectangular-cross-sectioned, sinuous headers tor boilers, comprising two sets ot' corrugated blocks each having a surface contiguration to give the desired shape to opposite sides of the header, each ot said blocks being substantially as long as the header to be formed, and a main key member between the sets ot blocks and extending through the header blank, said key member having parallel sides contacting with said sets of corrugated blocks, each et the corrugated blocks being -formed ot two parts with contacting faces extending along the axis of the header and making an angle with the sides of the header.

la A mandrel adapted for use in making rectangular-cross-sectioned, sinuous headers for boilers, comprising two sets of corru gated blocks each having a surface contiguration to give the desired shape to opposite sides of the header, each ot said blocks being not less in length than the distance be tween adjacent depressions in the sides ot nenas/i5 the headers, a main key member between the sets ot' blocks and extending through the header blank, said key member having parallel sides contacting with said sets ot corrugated blocks, and a supplemental key member at the side of the main key member and oi the same height as the main key member, said supplemental key member being formed oi two parts with contacting faces extending along the axis of the header and making an'angle with the sides of the header.

5. A mandrel adapted for use in making rectangular-cross-sectioned, sinuous headers` for boilers, comprising two sets of corrugated blocks each having a surface contiguration to give the desired shape to opposite sides ot the header, each ot' said blocks (Sli being not less in length than the distance between adjacent depressions in the sides oi the headers, a main key member between the sets oit blocks and extending through the header blank, said key member having paraln lel sides contacting with said sets oit.' corrugated blocks, and a supplemental key member at the side of the main key member and of the saine height as the main key member, each ot the corrugated blocks being formed of two parts with contacting iaces extending along the axis of the header and making an angle with sides oi the header, said supplemental key member being formed ot two parts with contacting faces extending along the axis ot' the header and making an angle with the sides ot the header.

6. A mandrel adapted for use in making rectangular cross-sectioned, sinuous headers for boilers, comprising two sets of Corrugated bloeks each having a surface contiguration to give the desired shape to opposite sides of the header. each of said blocks being not less in length than the distance between adjacent depressions in the sides et' the headers, and a keying device extending through the header blocks and supporting the blocks in operative position while the header is being formed, said keying device extending from side to side oll the header blank and being constructed and arranged to be collapsed in a direction at right angles to the sides of the header to permit the withdrawal oi the keying device after the header is formed.

CAMPBELL l?. HIGGINS. 

